Flow tube



H. H. MAPELSDEN AND C. F. BULLOCK.

FLOW TUBE.

APPHCATION FlLED APR, 7. I920.

Patented June 13, 1922.

N 1 i223:5 A M E; W 5:

inventors: l-Iarold l-I. Maloelsden, Charles F1344! locK 9 n/fifi'fl r q TheirALL rn ey- HAROLD H. MAPELSDEN AND CHARLES r. BULLOCK, or SCHENECT'ADY, NEW YORK, ASSIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK FLOW TUBE.

Specification 0f Letter-Shunt- Patcnted June 13, 1922.

I Application filed April 7, 1920. Serial No. 371,918.

Ton/l 4117mm 1' i may 002mm?! Be it known that we. IIAROLI) ll. MAP- nLsnnN and (names F. linemen, citizens of the United States, residing at Schenectady, county of Schenectady, State, of New York, have invented certain new and'useful Improvements in Flow Tubes, of which the following is a specification.

The present invention relates to tubes such as are used in connection with flow meters for creating apressure difference which bears a definite relation to the rate of flow and has for its object to provide an improved structure and arrangement in a tube of this character, which, while giving accurate results, can be cheaply built and easily installed.

For a consideration of what we believe to be novel and our invention, attention is directed to the accompanying description and the claims appended thereto.

In the drawing. the figure is a sectional view of a How tube embodying our invention the same being shown connected to an indicating instrument.

Referring to the drawing. our flow tube comprises a tube 5 of exact internal diameter and having a shoulder G therein, and

a nozzle 7 which is located in tube 5 and has a flange 8 which engages shoulder 63. nozzle 7 being firmly fixed in tube 5. As a preferable way of constructing such a flow tube, we talre a section of tube 5 of suitable length and of the same diameter as that of the pipe line into which it is to be inserted and of which it is to form-a part, and finish the inner surface to bring the tube to exact uniform internal diameter. We then counterbore the tube 5 from one end to form internal shoulder 6 and insert into the tube the nozzle 7 so its flange 8 fits against shoulder 6. The periphery of flange 8 makes a close fit with the surface of tube 5 and the nozzle is rigidly fixed therein by suitable means such as brazing for example. Nozzle 7 and tube 5 thus form a unitary structure adapted to be inserted into a pipe line or a part! thereof.

relation to the rate of flow. The leading pressure connection is indicated at 9 and is connected to the tube 5 on the upstream side of nozzle 7. The trailing pressure connection is indicated at 10. and is connected to tube 5 on the down-stream side of flange 8 and preferably between such flange and the downstream end of nozzle 7. Connections 9 and 10 are shown in the drawing as connecting to an instrument 11 adapted to indicate or indicate and record the pressure differences set up by the flow tube.

In the drawing, the flow tube is shown as being connected into a pipe line 12, adjacent pipe ends being joined by suitable couplings as indicated at 13.

Our improved flow tube has the advantage that it can be accurately dimensioned without difficulty so it can be accurately calibrated and that it can be manufactured at a low cost. Furthermore, it is very simple, comprising but two parts, neither of which is diflicult to make.

In the present instance tube 5 is shown -as being counterbored from the downstream patent statutes. we have described the principle of operation of our invention, together with the apparatus which we now consider to represent the best embodiment thereof, but we desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

What we claim as new and desire to secure by Letters Patent of the United States, 1s

1. A flow tube comprising a short section of straight pipe counterbored from one end to form a shoulder, and a nozzle fixed in said pipe section and pointing downstream, said nozzle having a flange which engages said shoulder to position the nozzle in the The direction of flow is as indicated by th pipe section, and being positioned some disarrow. The nozzle 7 points down streatance from the upstream; end of the tube the nozzle having a flared upstream endiifavhereby a length of accurately dimensioned setting up a pressure diflerence on the two and, as is well understood, the nozzle servegiipe section is provided in advance of the to convert pressure into velocity, thereby.

ozzle.

==2. A flow tube comprisin a short section sides of the nozzle which bears a definite of straight pipe counter red from its 110 downstream end to form an internal shoulder, and a nozzle fixed in said pipe section and projecting downstream. said nozzle having a flange which engages said shoulder to position the nozzle in ,the pipe section, and being positioned some distance from the lip-stream end of the tube whereby a length of accurately dimensioned pipe section is provided ,in advance of'the nozzle.

3. A flow tube comprising a short section of pipe, and a nozzle located wholly within such section, said nozzle having a flange which engages the bore of said section and is fixed thereto, and being positioned some distance from the up-striam end of the tube whereby a length of accurately dimensioned pipe section is provided. in advance of the nozzle.

In witness whereof, we have hereunto set our-hands this 6th day of April, 1920.

HAROLD H. MAPEIASDEN. CHARLES F. BULLOCK. 

